Heating systems keep your home warm and comfortable. If you live in a particularly cold climate, the function of your heating system is a high priority. Most central heating and cooling systems are classified as forced air systems, because they send air through ductwork for distribution. The ductwork can contain products that filter or clean the air. Radiant systems create heat and deliver it via components such as radiators that radiate the heat into the home. Boilers are a traditional radiant heat source.